State Historical Society of Iowa Library

From Ancestry.com Wiki

This statewide organization encompasses all the state historical operations, including the historical libraries (at the Des Moines address and at Iowa City—see below); State Archives (including manuscript, maps, school and institutional records, and photographs); museum; and membership and development of publications. The extensive holdings of the research library at the Des Moines location are the largest in the state. The staff is very responsive to written requests for general information, and the society’s website contains several bibliographies and finding aids (see list of publications under Periodicals).